to sign a form or contract which says that you agree to do a job or become a soldier; to persuade somebody to sign a form or contract like this
امضا کردن, قرارداد بستن, پیوستن, سپاهی شدن, عضو شدن, استخدام شدن
He signed on for five years in the army.
The company has signed up three top models for the fashion show.
synonym enlist